Add video notes

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diff --git a/md/writeup.md b/md/writeup.md
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 [Running disk images in QEMU](writeup/running_disk_images_in_qemu.md)  
 [Mqueue IPC example](writeup/mqueue_ipc_example.md)  
 [Swift OCR example](writeup/swift_ocr_example.md)  
+[Writing mount utility](writeup/writing_mount_utility.md)  
+
 
 ## Projects
 
@@ -48,6 +50,11 @@ title: Writeup page
 | [Routers](routers.md) | Routers | Dumps,photos |
 | [SAMSUNG XE303C12](writeup/devices/samsung_xe303c12.md) | Google chromebook with ARM CPU | [Manufacturer](http://www.samsung.com/us/computer/chrome-os-devices/XE303C12-A01US) | 
 
+## Non-tech
+[Notes on videos](writeup/notes_on_videos.md)  
+[Research uni math course content](research/math.md)  
+
+
 ## Archive
 [Create ELF file from scratch](http://archive.main.lv/writeup/create_elf_file_from_scratch.html)  
 [ASCIITex ascii text formating utility](http://archive.main.lv/writeup/asciitex_ascii_text_formating_utility.html)  
diff --git a/md/writeup/notes_on_videos.md b/md/writeup/notes_on_videos.md
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+title:Notes on videos
+keywords:math,statistics
+
+# Video review
+## Numberphile - The Best (and Worst) Ways to Shuffle Cards
+
+Video: https://www.youtube.com/watch?v=AxJubaijQbI&list=PLt5AfwLFPxWLDNtOEfUgBFX5YNEhltGzt
+
+The amount of times to shuffle depends on shuffling type:  
+riffle shuffle - 7 times   
+overhand shuffle - 10000  
+Smooshing aka wash , corgi, chemmy - 30 sec on a edge, 1 min is enough  
+
+If perfectly shuffled then 4.53 to guess of them papers:
+https://arxiv.org/pdf/math/0501401.pdf  
+https://www.jstor.org/stable/2323590?seq=1  
+
+Trailing the Dovetail to its Lair (7 shuffles)): http://bit.ly/1xU6uPI   
+Shuffling Cards and Stopping Times: http://bit.ly/1FR0ca1  
+Overhand Shuffles: http://bit.ly/1LNBSuU  
+
+
+### Numberphile - Shuffling Extra Footage (1/3) - Persi Diaconis
+Video: https://www.youtube.com/watch?v=1jfm42Qd7Qw&list=PLt5AfwLFPxWLDNtOEfUgBFX5YNEhltGzt&index=2
+
+Cut off phenomena happens when you shuffle and do randomness test, test
+going to pass after x steps, and after x steps is always pass, like a step or a border
+randomisation / shuffling schemes that doesn't have a cutoff phenomena.
+
+Asking question is there reasonable scheme to shuffle larger decks of cards, like
+in dungeon and dragons
+
+### Numberphile - Shuffling Extra Footage (2/3) - Persi Diaconis
+Video: https://www.youtube.com/watch?v=c_Hunaf0tWw&list=PLt5AfwLFPxWLDNtOEfUgBFX5YNEhltGzt&index=3
+
+with microphone in casino where able to recreate shuffle from a sound. because casino shufflers are
+perfect shufflers compare to not professional shufflers.
+shuffling machines aren't good they are worse shuffling then physical shuffling.  
+
+https://prglobalstore.com/products/automatic-card-shuffler?variant=30369630322740 maybe to get
+one of those?    
+
+Machines are going to be replaced with one that have different shuffling scheme with random number generator. Those machines you numbers that are have initial seed, and each number they add new one, there is cheats who  watch rolled out numbers on casino machine, and figure our right moment to
+join the game.
+
+### Numberphile - Shuffling Extra Footage (3/3) - Persi Diaconis
+Video: https://www.youtube.com/watch?v=RIGJH12vVCY&list=PLt5AfwLFPxWLDNtOEfUgBFX5YNEhltGzt&index=4
+
+Some history on why casinos don't use experts and don't research on math. And how businesses
+assume they are right without any proper research. About how in bridge game discovered proper
+probabilities of shuffling.